av3

#include<stdio.h>
int main ()
{ float a=5,b=7.5,c=10.2;
  float L,s,P;
  L=a+b+c;
  s= L/2;
  P= s* (s-a) * (s-b) * (s-c);
  printf("L= %.2f",L);
  printf("P= %.2f",P);



return 0;
}